Though David Lennon chalks it up to possible post-operation issues, I’d say John Maine’s poor 
After the game, Maine told reporters his shoulder “is still tight back there.”
Maine was coming off a good May, where he went 4-1 with an ERA below three. Shoulder tightness then was never an issue.
Maine did leave his last start after cruising through six innings as the latest casualty to a stomach virus that had been sweeping the team.
I’d say that has more to do with Saturday’s poor start then a surgery that he got months ago, especially after winning five of his last seven starts, pitching into the sixth inning in all of them.